In addition to your personal income tax liability, if your contracting salary is above the prevailing thresholds, both you and your company (limited or umbrella) will need to pay National Insurance Contributions to HMRC.
The National Insurance system was originally put in place to protect workers during times of sickness and unemployment. In recent years, National Insurance Contributions have raised an increasing proportion of total UK Treasury receipts, and the system is seen by many as an additional income tax in all but name.
During the 2019-20 tax year, for example, the Treasury raised just over £145bn from National Insurance Contributions, compared to around £194bn from ‘Income Tax’. In fact, more money is now raised from National Insurance than from VAT (£134 bn). See the full breakdown here.
All UK employers must pay Employers’ NICs on salaries paid to their employees, and the employees themselves must pay Employees’ NICs on any income they earn.
Here, we look at how NICs are calculated, for both employers and employees.
This article has been updated for the 2021/22 tax year.
National Insurance for Employees
If you’re a contractor, you will be an employee of your own limited company, an employee of an umbrella company employer, or in some cases, a PAYE employee of an employment agency.
Class 1 NICs are payable on any salaried income you receive, regardless of the business structure you work under.
During the 2021/22 tax year, employees must pay NICs of 12% on income falling between £184 and £967 per week, and at 2% on income above £967 per week.
In other words, you must pay 12% NICs on salaried income falling between the Primary Threshold (£9,568) and the Upper Earnings Limit of (£50,270), and 2% on any additional income above £50,270.
If you’re working via an umbrella company or a PAYE basis with an agency, income tax and NICs will be deducted at source and paid to HMRC on your behalf.
If you’re working via your own limited company, you have more flexibility over your exposure to National Insurance. Most limited company contractors elect to pay themselves small salaries (either below, or just above the prevailing NIC ‘primary threshold’) in order to minimise their NIC liabilities. National Insurance Contributions are not payable on company dividends.
National Insurance for Employers
All employers must pay Class 1 NICs on the salaries they pay to their staff.
If you’re working via an umbrella scheme (or contracting directly with an agency), then your employer will allow for employers’ NICs at source from your gross fees.
If you are contracting via your own limited company, the company must pay employers’ NICs on any salary payments.
For the 2021/22 tax year, employers’ NICs apply to salaries of over £170 per week at a rate of 13.8%.
If you annualise the weekly £170 threshold, no Employers’ NICs are payable if you draw an annual salary of £8,840 or less.
In April 2014, a new Employment Allowance was implemented, which reduces the Employers’ NICs paid by limited companies to their employers up to a maximum of £4,000 per year. This results in a saving to limited company owners who pay themselves a salary above the £8,840 Employers NIC threshold. The eligibility rules have been tightened several times in recent years.
Other Types of National Insurance
The ‘self-employed’ pay Class 2 and Class4 NICs. Class 2 liabilities are paid via self-assessment (the rate is currently £3.05/week on earnings of £6,515 or more per year).
Class 4 liabilities are worked out via the self-assessment process each year. The current Class 4 rate is 9% on annual profits of between £9,568 and £50,270 per year, and 2% on amounts above £50,270.
IT contractors rarely work on a ‘self-employed’ basis; the vast majority pay Class 1 contributions only as limited company or umbrella company employees.